/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraEditorModule.h
Gets the extensibility managers for outside entities to extend static mesh editor's menus and toolbars
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FExtensibilityManager](API\Editor\UnrealEd\Toolkits\FExtensibilityManager) > GetMenuExtensibilityManager()